an=5n-3, find the common difference
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a1=5(1)-3 =2
a2=5(2)-3=7
a3=5(3)-3=12
the req ap is 2,7,12
D=7-2=5
a2=5(2)-3=7
a3=5(3)-3=12
the req ap is 2,7,12
D=7-2=5
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